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A Comprehensive Analysis of PCB Testing and Final Inspection Processes

7 0 Aug 19.2025, 11:27:44

In the realm of Printed Circuit Boards (PCBs), which serve as the backbone of nearly all electrical devices, the testing and final inspection processes are of paramount importance. As the electronics industry continues to burgeon, driven by trends such as 5G, AI, and the miniaturization of devices, ensuring the quality of PCBs has become even more critical.Importance of Testing and InspectionPCBs are used in a wide range of applications, from consumer electronics like smartphones and laptops to high - end industries such as aerospace and medical equipment. In these diverse fields, the reliability of PCBs is non - negotiable. A single defective PCB can lead to system failures, product recalls, and significant financial losses. For example, in an AI server, where high - speed data processing is crucial, a malfunctioning PCB could disrupt the entire operation, affecting data analysis and cloud computing services.Types of TestsElectrical TestingContinuity and Shorts Testing: This is a fund...

What to Do About "Wrinkling" of Laminated Boards? Common Problems and Solutions in PCB Multilayer Board Lamination Process

28 0 Aug 14.2025, 09:42:29

Laminating a multilayer board is like "making a quilt" for a PCB, pressing layers of core boards and prepregs into one unit. But sometimes the surface ends up wrinkled like crumpled paper—a frustrating issue for PCB factories. In high-precision products like mobile motherboards and server PCBs, even tiny wrinkles can cause drilling errors or short circuits, leading to costly batch rejections.What Do Wrinkles Look Like?Post-lamination wrinkles vary: edge waves with noticeable height differences, mid-board bulges from poorly bonded prepregs, or hidden inner core misalignments visible only in cross-sections. They typically appear at corners and long edges—high-stress areas like loose fabric seams.Why Do Boards Wrinkle?1. Unruly PrepregsPrepregs act as "glue" for multilayers. Uneven resin content causes uneven lamination, while imprecise cutting leads to edge crumpling under pressure. Stale prepregs with clumped resin also create wrinkled, contour-like patterns.2. Stubborn Core BoardsWarpe...

Where Do the "Pinholes" on Pads Come From? Analysis of Plating Defects in PCB Copper Deposition Process

27 0 Aug 14.2025, 09:25:59

Nowadays, electronic devices are becoming increasingly thin and light, with circuits getting denser and denser. This has forced PCB pads to be made smaller, and the requirements for the copper deposition process have also risen accordingly. Just think, in high-precision equipment like 5G base stations and millimeter-wave radars, even a tiny pinhole of a few microns on a pad can cause signal interruption or direct solder joint detachment. These seemingly insignificant "little holes" are actually extremely troublesome plating defects in the copper deposition process, hiding a chain reaction of process details behind them.What Are Copper Deposition Pinholes?Copper deposition pinholes are tiny holes in the copper plating of PCB pads, usually with a diameter between 1 and 50 microns. They are almost invisible to the naked eye but are enough to damage the integrity of the plating. It's like a fishing net full of fine holes; it looks complete, but in fact, it can't hold the current at all. In...

Why Do White Spots Always Appear on PCB Surfaces? Analyzing the Problem of Solder Mask Blisters in Production

36 0 Aug 13.2025, 09:33:34

The PCB industry is developing at a remarkable pace these days, with technological upgrades happening as quickly as flipping through the pages of a book. Just look, devices related to artificial intelligence, like servers and data centers, have a huge demand for high - density interconnect (HDI) and high - layer count PCBs. The electric vehicle market is also booming, requiring PCBs that can carry large currents, are reliable, and durable. However, as the industry charges forward, there are quite a few troubles. The constant appearance of "white spots" on PCB surfaces is a major headache, and this is mostly related to blisters in the solder mask layer.What Are "White Spots" and Solder Mask Blisters?The "white spots" on the PCB surface are visible discolored areas, and there are many reasons for this, with solder mask blisters being a common one. The solder mask is usually green and plays an important role in PCB manufacturing. It can protect the copper circuit from oxidation, prevent s...

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